Well that's for sure wrong too. That 3% for the industry is outdated, and whatever the current % I think it would refer to % of swiss watches not % of swiss mechanical watches.
Anyway COSC is just marketing bullshit in my opinion, I don't think it matters or many people care about it, if they ever did. COSC is like Consumer Reports/JD Power (& Associates) certificates but for watches. People have long realized the useless scam of such things and know big corporations are probably slanging crap products that work more or less as expected, with a shady-at-best warranty in case it doesn't, and don't care about these tests.
That inflation link means you could have bought and worn a mechanical Rolex you liked wearing for decades and made money on it! And at a return % way better than saving the cash and more comparable to the % investing in stocks. Assuming you're diversified, anytime you can enjoy an investment more than just a # sitting in a bank or brokerage account somewhere that is great. Sign me up.
How have the prices of second-hand quartz watches compared to the prices of 2nd hand mechanical watches? Not good for quartz defenders I am guessing. What's the point of companies like Breitling continuing to make quartz watches anyway...